Whether it's your birthday, graduation, or another milestone, you know the drill: Your friend is not there. She will cancel plans, cut phone calls short, or simply not show up when you need her the most..for what? A man of course.
So what do you do? Let's face it, this behavior stings. So, do you (a) drop her completely, or (b) put your friendship on the back burner. Well, it depends, on how she behaved before this guy entered the picture. If she was a truly loyal friend, and all of a sudden, the love of her life entered the picture, then, yes, cut her some slack...to a point. If she still treats you like a second class citizen two years from now, then it's time to re-evaluate the friendship.
But if she is a serial dater, and every guy becomes the love of her life, then I would cut her loose right now. And it doesn't mean you have to completely drop her as a friend. You can put her in the "acquaintance" category. What I mean is, don't drop everything when she calls you with the tiniest problem. Because honestly, would she do the same for you? Most likely not.
Take your time to return calls. Only hang out with her when a group of you made plans. But if you set aside time for her, she will probably cancel. Bottom line: If you have time, then sure, talk to her. But don't make the time for her. Save your time and energy for people who would be there for you. Those types are rare...But if you find one, hold on for life.